51. Henry often goes to work by bike. But this morning he______ go by bus, for it looks as if it is going to rain.

A. can　　　　 B. must　　　　 C. shall　　　 D. may

50. Tim borrowed a car from his brother and gave his friend Lorry ____ ride to _____center of the town.

A. the; a　　　 B. a; the　　　 C. 不填; a　　　 D.不填; the

49. Johnny studied in a university, and he ______a few dollars by doing odd jobs in his spare time.

　A. picked up　　　　　 B. took up　　　　　　　 C. made up　　　　　 D. turned up

48. －What about going for picnic this weekend?

　 － 　　　.

A. It’s your opinion　 B. I don’ t mind　　 C. Good idea　 D. That’s your decision

47. You can`t watch TV, 　______ you are sure you can finish your work on time.

A. unless　　　 B. if　　　 C. when　　　　 D. as

46. ------Is ______here?

　 -----No, Bank and Lucy were absent.

　 A. anybody　　　 B. somebody　　　 C. everybody　　　 D. nobody

45. But as a matter of fact, I didn`t begin to work _______ he had gone.

A. until　　　　 B. unless　　　　　 C. after　　　　　 D. because

44. _______with what little Tom said, the teacher decided to take him as his new student.

　 A. To satisfy　　 B. Having satisfied　　　 C. Satisfied　　　 D. Satisfying

43. Do that again_______ I`ll call a policeman.

A. but　　 B. and　　　 C. or　　 D. so

42.Martin ________ Shanghai several times, and he knew it very well.

　 A. has been visiting　　 B. had visited　　 C. has visited　　 D. had been visited